COZY has taken the craft of building a wood-fired sauna stove to a higher level. The SW-TW's convenient through-the-wall design lets you feed the firebox from outside your sauna so you don't need to bring wood into the room. Cozy Heat's SW-TW wood-burning sauna stoves are made in Estonia, where sauna bathing is a way of life. Designed for performance and durability and strength. The part of the wood-burning heater that must be the strongest, the flame cutter, is made of sturdy, 5mm-thick stainless steel making COZY heaters extremely robust. Wood-fired sauna stoves produce a mild and long-lasting heat and are designed for ladling water over hot stones to create the most satisfying steam sauna. Experience the epitome of comfort and style with the Cozy Heat SW-TW wood stove. Installation and operation manual Stove utilizes 25%-40% less fuel than comparable sauna stoves Boasts minimal safety distances Sauna room sizes:12kW- 210 to 423 cu.ft.18kW- 317 to 635 cu.ft. Stone Requirements:12kW- minimum of 265lbs of stones18kW- minimum of 353lbs of stones 12kW- minimum of 265lbs of stones 18kW- minimum of 353lbs of stones Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply).